The stranger was a man named Lashawn MartenMartin Redrick, who had a history of trouble with the law and had been living in a facility for homeless people with mental illnesses. Witnesses said that Marten, who is black, was agitated, and that he declared that he was going "to punch the next white person he saw."

That person was Babbitt. MartenRedrick struck the 62-year-old, and Babbitt hit his head on the ground hard, and he fought passersby who rushed to Babbitt's aid.

Babbitt was able to stand, but fell into a coma after he was taken to the hospital and was later declared brain dead. Marten is being held on $1 million bond. Ray Kelly, New York City's police commissioner, said officials were investigating whether to add hate crime charges to the assault charges that Marten already faces.

The Babbitt story is full of sad details. According to The New York Times, the retired subway train conductor was the sole caretaker for his 94-year-old mother, who has Alzheimer's disease. (Babbitt's lone sister died of cancer years ago.) It's not clear who will be responsible for his mother's care.

"Jeffrey Babbit [sic] was at every New York comic convention and book signing that I attended. He was [a supporter of Tucci's comic book, Shi] from the very beginning and bought every book and print I ever produced and would give me train books and magazines to pass on to my son William. Jeffrey was a gentle soul who NEVER said a bad thing to anyone. I am shocked and saddened beyond belief that I'll never see my friend's smile again as he was brutally beaten to death by some animal who randomly picked out Jeffrey to murder because he was white."

UPDATE: The New York Times followed up on this incident and filled in some details about Lashawn Marten's past. (We've corrected the post accordingly.) For starters, "Lashawn Marten" is an alias — his real name is Martin Redrick, and he has a decades-long criminal history that includes petty crimes, threats and assaults. He'd been arrested at least 20 times since 2000, and had been diagnosed as a schizophrenic.

"Martin did not like authority and as we were growing up, the only people with authority were white people," said a brother, Joseph Redrick, 47. "A lot of times that problem with authority was transferred to white people."